Springfield Urban-Warrior Challenge, a 12.4K timed obstacle race, 7 a.m. April 7, Plaster Sports Complex, 1015 E. Grand St., campus of Missouri State University. Participants can register as an individual or with a team. Obstacles are designed by the MSU Army ROTC. Entry fees: $75 by Dec. 31, $275 for a team of four; fees continue to rise through April 6. Discounts are given to active or retired military members, MSU students and police and firefighters. Registration and information: www.embracethesuc.com